Specimens from the Rio Grande to Mirador and Orizaba are quite identical, with, of course, differences among individuals. This “species” is not, in our opinion, separable from the _H. rufus_ specifically; but is a race, representing the latter in the region given above, where the _rufus_ itself is never found. The relations of these two forms are exactly paralleled in the _Thryothorus ludovicianus_ and _T. berlandieri_, the latter being nothing more than the darker Southern representation of the former. The Texas Thrasher appears to belong only to the Avifauna of the Southwest. It first appears as a bird of the valley of the Rio Grande, and extends from thence southward through Eastern Mexico to Cordova and Orizaba. In Arizona it is replaced by _H. palmeri_, _H. lecontei_, and _H. crissalis_, in California by _H. redivivus_, and at Cape St. Lucas by _H. cinereus_, while in the United States east of the Rocky Mountains it is represented by its nearer ally _H. rufus_. HABITS. The eggs of this species are hardly distinguishable from those of the common Brown Thrasher (_H. rufus_), of the Atlantic States. The color of their ground is a greenish-white, which is thickly, and usually completely, covered with fine markings of a yellowish-brown. They have an average length of 1.13 inches, by .79 in breadth. So far as I have had an opportunity of observing, they do not vary from these measurements more than two per cent in length or one per cent in breadth. Their nests are usually a mere platform of small sticks or coarse stems, with little or no depression or rim, and are placed in low bushes, usually above the upper branches. In regard to the distinctive habits of this species I have no information. Harporhynchus cinereus, XANTUS. CAPE ST. LUCAS THRASHER. _Harporhynchus cinereus_, XANTUS, Pr. A. N. Sc. 1859, 298.—BAIRD, IB., 303; Review, 46.—SCLATER, Catal. 1861, 8, no. 49.—ELLIOT, Illust., I. pl. i.—COOPER, Birds Cal. 1, 19. SP. CHAR. Bill as long as the head; all the lateral outlines gently decurved from the base. Bristles not very conspicuous, but reaching to the nostrils. Wings considerably shorter than the tail, much rounded. First primary broad, nearly half the length of the second; the third to the seventh quills nearly equal, their tips forming the outline of a gentle curve; the second quill shorter than the ninth. Tail considerably graduated, the lateral feathers more than an inch the shorter. Legs stout; tarsi longer than middle toe, distinctly scutellate, with seven scales.